EPA Science Inventory

A METHOD TO INCORPORATE ECOLOGY INTO RESIDENCE TIME OF CHEMICALS IN EMBAYMENTS: LOCAL EFFECT TIME

Citation:

Abdelrhman, M. A METHOD TO INCORPORATE ECOLOGY INTO RESIDENCE TIME OF CHEMICALS IN EMBAYMENTS: LOCAL EFFECT TIME . Integrated Environmental Assessment and Management. Allen Press, Inc., Lawrence, KS, 2(3):247-252, (2006).

Description:

Residence times are classically defined by the physical and chemical aspects of water bodies rather than by their ecological implications. Therefore, a more clear and direct connection between the residence times and ecological effects is necessary to quantitatively relate these time scales to ecology. The concept of "local effect time" (LET) for embayments is proposed in this paper as a time scale with spatial resolution that relates to ecological components and their spatial distribution within an embayment. The LET can predict the susceptibility of real-world ecological components to change from one condition to another. It can provide an efficient way to allow managers and agencies to evaluate the degree of stress or relief from current or projected changes in the loading of contaminants or nutrients. The steps for calculating LETs and defining their correlation with the existing ecological components and processes of an embayment are presented along with an illustrative application to loading from riverine inflow. The LET successfully identified the areas within the water body that could be prone to ecological changes due to the loading rate of freshwater and its constituents.

Purpose/Objective:

To determine a method for the direct connection between residence times and ecological effects

Record Details:

Record Type: DOCUMENT (JOURNAL/PEER REVIEWED JOURNAL)
Start Date: 07/01/2006
Completion Date: 07/01/2006
Record Last Revised: 06/21/2007
Record Created: 12/08/2004
Record Released: 12/08/2004
OMB Category: Other
Record ID: 104842

Organization:

U.S. ENVIRONMENTAL PROTECTION AGENCY

OFFICE OF RESEARCH AND DEVELOPMENT

NATIONAL HEALTH AND ENVIRONMENTAL EFFECTS RESEARCH LAB

ATLANTIC ECOLOGY DIVISION

HABITATS EFFECT BRANCH